A peculiar genus of rotifers, remarkable the absence of ciliated disks. By some zoölogists it is considered like ancestral form of the Arthropoda.
A genus of freshwater rotifers, associated with the household Notommatidæ. Your body is elongated and cylindrical, with a projecting end, yet not annulose, the corona is obliquely truncated, your head holds auricles, and the tropin tend to be virgate. Also Notommata.